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ATF16V8CZ-12XC Datasheet(PDF) 6 Page - ATMEL Corporation |
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ATF16V8CZ-12XC Datasheet(HTML) 6 Page - ATMEL Corporation |
6 / 10 page Registered Output Preload The ATF16V8CZ’s registers are provided with circuitry to allow loading of each register with either a high or a low. This feature will simplify testing since any state can be forced into the registers to control test sequencing. A JEDEC file with preload is generated when a source file with vectors is compiled. Once downloaded, the JEDEC file preload sequence will be done automatically by ap- proved programmers. Security Fuse Usage A single fuse is provided to prevent unauthorized copying of the ATF16V8CZ fuse patterns. Once programmed, fuse verify and preload are inhibited. However, the 64-bit User Signature remains accessible. The security fuse should be programmed last, as its effect is immediate. Input and I/O Pin Keeper Circuits The ATF16V8CZ contains internal input and I/O pin keeper circuits. These circuits allow each ATF16V8CZ pin to hold its previous value even when it is not being driven by an external source or by the device’s output buffer. This helps insure that all logic array inputs are at known, valid logic levels. This reduces system power by preventing pins from floating to indeterminate levels. By using pin keeper circuits rather than pull-up resistors, there is no DC current required to hold the pins in either logic state (high or low). These pin keeper circuits are implemented as weak feed- back inverters, as shown in the Input Diagram below. These keeper circuits can easily be overdriven by stand- ard TTL- or CMOS-compatible drivers. The typical over- drive current required is 40 µA. Input Diagram I/O Diagram Compiler Mode Selection Registered Complex Simple Auto Select ABEL, Atmel-ABEL P16V8R P16V8C P16V8AS P16V8 CUPL G16V8MS G16V8MA G16V8AS G16V8A LOG/iC GAL16V8_R (1) GAL16V8_C7 (1) GAL16V8_C8 (1) GAL16V8 OrCAD-PLD “Registered” “Complex” “Simple” GAL16V8A PLDesigner P16V8R P16V8C P16V8C P16V8A Tango-PLD G16V8R G16V8C G16V8AS G16V8 Note: 1. Only applicable for version 3.4 or lower. 6 ATF16V8CZ |
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